/*
 * Copyright (c) 2018, vindell (https://github.com/vindell).
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.github.vindell.dbperms.jdbc.wrapper;

import java.sql.Array;
import java.sql.Blob;
import java.sql.CallableStatement;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.NClob;
import java.sql.PreparedStatement;
import java.sql.SQLClientInfoException;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.SQLXML;
import java.sql.Savepoint;
import java.sql.Statement;
import java.sql.Struct;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.Executor;

import com.github.vindell.dbperms.jdbc.common.CallableStatementInformation;
import com.github.vindell.dbperms.jdbc.common.ConnectionInformation;
import com.github.vindell.dbperms.jdbc.common.PreparedStatementInformation;
import com.github.vindell.dbperms.jdbc.common.StatementInformation;
import com.github.vindell.dbperms.jdbc.event.JdbcEventListener;

/**
 * This implementation wraps a {@link Connection} and notifies a
 * {@link JdbcEventListener} about certain method invocations.
 * <p>
 * This class implements the Wrapper or Decorator pattern. Methods default to
 * calling through to the wrapped request object.
 *
 * @see Connection
 */
public class ConnectionWrapper extends AbstractWrapper implements Connection {

	private final Connection delegate;
	private final JdbcEventListener jdbcEventListener;
	private final ConnectionInformation connectionInformation;

	public static ConnectionWrapper wrap(Connection delegate, JdbcEventListener eventListener,
			ConnectionInformation connectionInformation) {
		if (delegate == null) {
			return null;
		}
		final ConnectionWrapper connectionWrapper = new ConnectionWrapper(delegate, eventListener,
				connectionInformation);
		return connectionWrapper;
	}

	/**
	 * Should only be called by
	 * {@link #wrap(Connection, JdbcEventListener, ConnectionInformation)}
	 * <p>
	 * Setting to protected instead of private, so that CGLIB can create a
	 * subclass/proxy See also:
	 * {@code net.sf.cglib.proxy.Enhancer#filterConstructors} (protectedOk: true)
	 */
	protected ConnectionWrapper(Connection delegate, JdbcEventListener jdbcEventListener,
			ConnectionInformation connectionInformation) {
		super(delegate);
		if (delegate == null) {
			throw new NullPointerException("Delegate must not be null");
		}
		this.delegate = delegate;
		this.connectionInformation = connectionInformation;
		this.jdbcEventListener = jdbcEventListener;
	}

	public JdbcEventListener getJdbcEventListener() {
		return this.jdbcEventListener;
	}

	public JdbcEventListener getEventListener() {
		return jdbcEventListener;
	}

	public Connection getDelegate() {
		return delegate;
	}

	public ConnectionInformation getConnectionInformation() {
		return connectionInformation;
	}

	@Override
	public Statement createStatement() throws SQLException {
		return StatementWrapper.wrap(delegate.createStatement(), new StatementInformation(connectionInformation),
				jdbcEventListener);
	}

	@Override
	public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException {
		return StatementWrapper.wrap(delegate.createStatement(resultSetType, resultSetConcurrency),
				new StatementInformation(connectionInformation), jdbcEventListener);
	}

	@Override
	public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability)
			throws SQLException {
		return StatementWrapper.wrap(
				delegate.createStatement(resultSetType, resultSetConcurrency, resultSetHoldability),
				new StatementInformation(connectionInformation), jdbcEventListener);
	}

	@Override
	public PreparedStatement prepareStatement(String sql) throws SQLException {
		return PreparedStatementWrapper.wrap(delegate.prepareStatement(sql),
				new PreparedStatementInformation(connectionInformation, sql), jdbcEventListener);
	}

	@Override
	public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency)
			throws SQLException {
		return PreparedStatementWrapper.wrap(delegate.prepareStatement(sql, resultSetType, resultSetConcurrency),
				new PreparedStatementInformation(connectionInformation, sql), jdbcEventListener);
	}

	@Override
	public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency,
			int resultSetHoldability) throws SQLException {
		return PreparedStatementWrapper.wrap(
				delegate.prepareStatement(sql, resultSetType, resultSetConcurrency, resultSetHoldability),
				new PreparedStatementInformation(connectionInformation, sql), jdbcEventListener);
	}

	@Override
	public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException {
		return PreparedStatementWrapper.wrap(delegate.prepareStatement(sql, autoGeneratedKeys),
				new PreparedStatementInformation(connectionInformation, sql), jdbcEventListener);
	}

	@Override
	public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException {
		return PreparedStatementWrapper.wrap(delegate.prepareStatement(sql, columnIndexes),
				new PreparedStatementInformation(connectionInformation, sql), jdbcEventListener);
	}

	@Override
	public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException {
		return PreparedStatementWrapper.wrap(delegate.prepareStatement(sql, columnNames),
				new PreparedStatementInformation(connectionInformation, sql), jdbcEventListener);
	}

	@Override
	public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency,
			int resultSetHoldability) throws SQLException {
		return CallableStatementWrapper.wrap(
				delegate.prepareCall(sql, resultSetType, resultSetConcurrency, resultSetHoldability),
				new CallableStatementInformation(connectionInformation, sql), jdbcEventListener);
	}

	@Override
	public CallableStatement prepareCall(String sql) throws SQLException {
		return CallableStatementWrapper.wrap(delegate.prepareCall(sql),
				new CallableStatementInformation(connectionInformation, sql), jdbcEventListener);
	}

	@Override
	public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
		return CallableStatementWrapper.wrap(delegate.prepareCall(sql, resultSetType, resultSetConcurrency),
				new CallableStatementInformation(connectionInformation, sql), jdbcEventListener);
	}

	@Override
	public void commit() throws SQLException {
		SQLException e = null;
		long start = System.nanoTime();
		try {
			jdbcEventListener.onBeforeCommit(connectionInformation);
			delegate.commit();
		} catch (SQLException sqle) {
			e = sqle;
			throw e;
		} finally {
			jdbcEventListener.onAfterCommit(connectionInformation, System.nanoTime() - start, e);
		}
	}

	@Override
	public void rollback() throws SQLException {
		SQLException e = null;
		long start = System.nanoTime();
		try {
			jdbcEventListener.onBeforeRollback(connectionInformation);
			delegate.rollback();
		} catch (SQLException sqle) {
			e = sqle;
			throw e;
		} finally {
			jdbcEventListener.onAfterRollback(connectionInformation, System.nanoTime() - start, e);
		}
	}

	@Override
	public void rollback(Savepoint savepoint) throws SQLException {
		SQLException e = null;
		long start = System.nanoTime();
		try {
			jdbcEventListener.onBeforeRollback(connectionInformation);
			delegate.rollback(savepoint);
		} catch (SQLException sqle) {
			e = sqle;
			throw e;
		} finally {
			jdbcEventListener.onAfterRollback(connectionInformation, System.nanoTime() - start, e);
		}
	}

	@Override
	public String nativeSQL(String sql) throws SQLException {
		return delegate.nativeSQL(sql);
	}

	@Override
	public void setAutoCommit(boolean autoCommit) throws SQLException {
		delegate.setAutoCommit(autoCommit);
	}

	@Override
	public boolean getAutoCommit() throws SQLException {
		return delegate.getAutoCommit();
	}

	@Override
	public void close() throws SQLException {
		SQLException e = null;
		try {
			delegate.close();
		} catch (SQLException sqle) {
			e = sqle;
			throw e;
		} finally {
			jdbcEventListener.onAfterConnectionClose(connectionInformation, e);
		}
	}

	@Override
	public boolean isClosed() throws SQLException {
		return delegate.isClosed();
	}

	@Override
	public DatabaseMetaData getMetaData() throws SQLException {
		return delegate.getMetaData();
	}

	@Override
	public void setReadOnly(boolean readOnly) throws SQLException {
		delegate.setReadOnly(readOnly);
	}

	@Override
	public boolean isReadOnly() throws SQLException {
		return delegate.isReadOnly();
	}

	@Override
	public void setCatalog(String catalog) throws SQLException {
		delegate.setCatalog(catalog);
	}

	@Override
	public String getCatalog() throws SQLException {
		return delegate.getCatalog();
	}

	@Override
	public void setTransactionIsolation(int level) throws SQLException {
		delegate.setTransactionIsolation(level);
	}

	@Override
	public int getTransactionIsolation() throws SQLException {
		return delegate.getTransactionIsolation();
	}

	@Override
	public SQLWarning getWarnings() throws SQLException {
		return delegate.getWarnings();
	}

	@Override
	public void clearWarnings() throws SQLException {
		delegate.clearWarnings();
	}

	@Override
	public Map<String, Class<?>> getTypeMap() throws SQLException {
		return delegate.getTypeMap();
	}

	@Override
	public void setTypeMap(Map<String, Class<?>> map) throws SQLException {
		delegate.setTypeMap(map);
	}

	@Override
	public void setHoldability(int holdability) throws SQLException {
		delegate.setHoldability(holdability);
	}

	@Override
	public int getHoldability() throws SQLException {
		return delegate.getHoldability();
	}

	@Override
	public Savepoint setSavepoint() throws SQLException {
		return delegate.setSavepoint();
	}

	@Override
	public Savepoint setSavepoint(String name) throws SQLException {
		return delegate.setSavepoint(name);
	}

	@Override
	public void releaseSavepoint(Savepoint savepoint) throws SQLException {
		delegate.releaseSavepoint(savepoint);
	}

	@Override
	public Clob createClob() throws SQLException {
		return delegate.createClob();
	}

	@Override
	public Blob createBlob() throws SQLException {
		return delegate.createBlob();
	}

	@Override
	public NClob createNClob() throws SQLException {
		return delegate.createNClob();
	}

	@Override
	public SQLXML createSQLXML() throws SQLException {
		return delegate.createSQLXML();
	}

	@Override
	public boolean isValid(int timeout) throws SQLException {
		return delegate.isValid(timeout);
	}

	@Override
	public void setClientInfo(String name, String value) throws SQLClientInfoException {
		delegate.setClientInfo(name, value);
	}

	@Override
	public void setClientInfo(Properties properties) throws SQLClientInfoException {
		delegate.setClientInfo(properties);
	}

	@Override
	public String getClientInfo(String name) throws SQLException {
		return delegate.getClientInfo(name);
	}

	@Override
	public Properties getClientInfo() throws SQLException {
		return delegate.getClientInfo();
	}

	@Override
	public Array createArrayOf(String typeName, Object[] elements) throws SQLException {
		return delegate.createArrayOf(typeName, elements);
	}

	@Override
	public Struct createStruct(String typeName, Object[] attributes) throws SQLException {
		return delegate.createStruct(typeName, attributes);
	}

	@Override
	public void setSchema(String schema) throws SQLException {
		delegate.setSchema(schema);
	}

	@Override
	public String getSchema() throws SQLException {
		return delegate.getSchema();
	}

	@Override
	public void abort(Executor executor) throws SQLException {
		delegate.abort(executor);
	}

	public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException {
		delegate.setNetworkTimeout(executor, milliseconds);
	}

	@Override
	public int getNetworkTimeout() throws SQLException {
		return delegate.getNetworkTimeout();
	}

}
